Answers
Answer:
c
Explanation:
Related Questions
You have a vial containing 20.0g of oxygen gas. What is the percent composition of oxygen?
SELECT AN ANSWER
Cannot be determined without more information
83%
100%
90.8% oxygen
pleaseeeeeeee!!!!!!!!!
Answers
What happen when potassium react with cold water?
Answers
Answer:
the metal melts and floats
Explanation:
When potassium is added to water, the metal melts and floats. It moves around very quickly on the surface of the water. The hydrogen ignites instantly. The metal is also set on fire, with sparks and a lilac flame.
Answer:
It reacts rapidly to form a colorless solution of potassium hydroxide.
Explanation:
Potassium metal reacts very rapidly with water to form a colorless basic solution of potassium hydroxide (KOH) and hydrogen gas (H 2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.
Diego runs away from zombies at 11 km/h for 3 h.
How far does he go?
Answers
Answer:
33 km in 3 hours
11/1= 11
11*3=33
Explanation:
Which idea was supported by Aristarchus, Copernicus, and Galileo?
The planets have epicycles.
The planets revolve around the Sun.
The stars rotate around the Sun.
The center of the solar system is Earth.
Answers
Aristarchus, Copernicus, and Galileo all supported the idea that the planets revolve around the Sun.
The sun is the center of the solar system. All the early astronomers agreed to this fact.
Aristarchus placed the sun at the center of the solar system and postulated the fact that planets rotate in circular orbits around the Sun.
Copernicus in his work published in 1543 also placed the sun at the center of the solar system with Earth and other planets moving around it.
Using the Telescopes he made himself, Galileo also discovered that the sun is at the center of the solar system and planets orbited around the sun and not vice versa.
Therefore; Aristarchus, Copernicus, and Galileo all supported the idea that the planets revolve around the Sun.
Learn more; https://brainly.com/question/931651
Answer:B
Explanation:i said so
In Ms. Baker’s science class, students filled two glass bottles with equal amounts of water and attached a balloon to the top of each bottle. The bottle on the right is heated on a hot plate to 80°C (176°F), while the bottle on the left is kept at room temperature, 21°C (70°F). After several minutes, the students observe that the balloon on the right inflates. (SC.5.P.9.1)
Which statement best explains the students’ observation?
The heat slows down a chemical change, producing the gas to fill in the balloon.
The heat speeds up a chemical change, producing a new substance.
The heat slows down a physical change, causing the water level to decrease.
The heat speeds up a physical change, causing the liquid to turn into a gas.
this is a science question but science doesnt show up
Answers
Answer:
D. The heat speeds up a physical change, causing the liquid to turn into a gas.
Explanation:
7. Balance the following equation. What is the coefficient for Oxygen?*
C.H. +0,-> C0, +H20
2
4
5
8
8. Pentane (CsH22) undergoes a combustion reaction. What is the coefficient
required in front of pentane in its balanced equation? *
C.H2 +0,-> C0, + H2O
5
4
2
1
I know it’s tho questions but PLEASE PLEASE help me it’s for a test and I don’t wanna fail I would REALLY appreciate it if someone could help me with this thanks youu !!!
Answers
Answer:
of 7 I guess the and is 2 I don't know anything about 8
which one of these would be the best example for kinetic energy
A roller coaster at the top of the tallest hill
A pendulum at the greatest height of it's swing
A drawn bowstring prior to being released
A marble about to reach the bottom of the slope
Answers
Answer:
a marble about to reach the bottom of the slope
Explanation:
hope this helps
Electron X can change to a higher energy level or a lower energy level. Which statement is true of electron X?
1
Electron X emits energy when it changes to a higher energy level.
2
Electron X absorbs energy when it changes to a higher energy level.
3
Electron X absorbs energy when it changes to a lower energy level.
4.
Electron X neither emits nor absorbs energy when it changes energy level.
Answers
Answer: 2) Electron X absorbs energy when it changes to a higher energy level.
Explanation:
The electrons in an atom exist in various energy levels. When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. When an electron moves from a higher to a lower energy level, energy is released (often as light).
Which of the following elements does not form hydride by direct heating with
hydrogen gas?
A. Be
B. Mg
C. Si
D. Ba
Answers
Hope this helps! ^^
PLEASE HELP AND EXPLAIN!Calculate the energy required to heat 187.0 g of ammonia from 36.1 °C to 52.9 °C. Assume the specific heat capacity of ammonia under these conditions is
4.703.g. K. Round your answer to 3 significant digits.
Answers
Answer:
[tex]E=1.48x10^4J[/tex]
Explanation:
Hello!
In this case, since the energy implied in a heating process is computed by using the following equation:
[tex]E=mC(T_f-T_i)[/tex]
Whereas m is the mass, C the specific heat and T the temperature. In such a way, by plugging in the given mass, specific heat and temperatures, we obtain the following energy:
[tex]E=187.0g*4.703\frac{J}{g\°C} (52.9\°C-36.1\°C)\\\\E=1.48x10^4J[/tex]
Considering that the specific heat can by used by unit of °C or K because their difference is equivalent.
Regards!
38 points!! >:D
Witch best describes what is required for sny sound wave to travel?
Empty space
Any medium
Solid
Liquid
Answers
Answer: which*
Explanation:
2 AgNO3(aq)+(NH4)2CO3(aq)->Ag2CO3(s) +2NH4NO3(aq)
Answers
The given question is incomplete. the complete question is:
Write the net ionic equation for the reaction [tex]2AgNO_3(aq)+(NH_4)_2CO_3(aq)->Ag_2CO_3(s)+2NH_4NO_3(aq)[/tex]
Answer: [tex]2Ag^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]
Explanation:
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The given chemical equation is:
[tex]2AgNO_3(aq)+(NH_4)_2CO_3(aq)->Ag_2CO_3(s)+2NH_4NO_3(aq)[/tex]
The complete ionic equation is:
[tex]2Ag^+(aq)+2NO_3^-(aq)+2NH_4^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)+2NH_4^+(aq)+2NO_3^-(aq)[/tex]
The ions which are present on both the sides of the equation are ammonium and nitrate ions and hence are not involved in net ionic equation.
Hence, the net ionic equation is [tex]2Ag^+(aq)+CO_3^{2-}(aq)\rightarrow Ag_2CO_3(s)[/tex]
Question 5 (1 point)
How many moles of oxygen gas is needed to produce 36 grams of water?
Answers
Answer:
1 Oxygen atom has a mass of 16 grams, thus diatomic oxygen weights twice as much- 32 grams. Hence 32 grams is needed.
What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical equation? ALLO, + 3C SH 2Al + 3CO
a. 31.8 g
b. 30g
c. 101.2 g
d. 45 g
e. 7.9 g
Answers
Answer: 31.8 g
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Al_2O_3=\frac{60.0g}{102g/mol}=0.59moles[/tex]
[tex]\text{Moles of} C=\frac{30.0g}{12g/mol}=2.5moles[/tex]
[tex]Al_2O_3+3C\rightarrow 2Al+3CO[/tex]
According to stoichiometry :
1 mole of [tex]Al_2O_3[/tex] require 3 moles of [tex]C[/tex]
Thus 0.59 moles of [tex]Al_2O_3[/tex] will require=[tex]\frac{3}{1}\times 0.59=1.77moles[/tex] of [tex]C[/tex]
Thus [tex]Al_2O_3[/tex] is the limiting reagent as it limits the formation of product and [tex]C[/tex] is the excess reagent as it is present in more amount than required.
As 1 mole of [tex]Al_2O_3[/tex] give = 2 moles of [tex]Al[/tex]
Thus 0.59 moles of [tex]Al_2O_3[/tex] give =[tex]\frac{2}{1}\times 0.59=1.18moles[/tex] of [tex]Al[/tex]
Mass of [tex]Al=moles\times {\text {Molar mass}}=1.18moles\times 27g/mol=31.8g[/tex]
Thus 31.8 g of [tex]Al[/tex] will be produced from the given masses of both reactants.
What determines the placement of an element on the Periodic table
Answers
Answer:
Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.
Explanation:
Answer: Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.
Explanation:
compare earths compositional layers with its structural layer
Answers
Answer:
The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties. The outermost solid layer of a rocky planet or natural satellite. Chemically distinct from the underlying mantle.
The density of water is 1.0 mg
true or false ?
Answers
The density of water is 1.0 mg so it’s
Answer:
True. the density of water is 1.0 mg
i need help with this
Answers
Answer:
hope it helps you.......
Someone please help me please
Answers
Answer:
point 2 and 4
Explanation:
because at those point temperature is constant
Which of the following atoms has the lowest first ionization energy: nitrogen, phosphorus, or arsenic?
Answers
Answer:
Arsenic
Explanation:
The atom that has the lowest first ionization energy is Arsenic.
The first ionization energy is the energy needed to remove the most loosely bound electron of an atom in the gas phase in the ground state.
Ionization energy generally deals with the measure of the readiness of an atom to lose an electron.
Generally, down a group from top to bottom, ionization energy decreases because of the increasing atomic radii and increasing shielding /screening effect on the outermost shell electrons hence the electrons are held less tightly to the nucleus. So, nitrogen, phosphorous and arsenic belongs to the same group and arsenic will have the least first ionization energy.CH3OCH3 (ether) will dissolve in water because
Select one:
a. polar solutes dissolve in polar solvents.
b. ionic solutes dissolve in polar solvents.
c. polar solutes dissolve in non-polar solvents.
d. ionic solutes dissolve in non-polar solvents.
e. non-polar solutes dissolve in polar solvents.
Answers
Answer:
a. polar solutes dissolve in polar solvents.
Explanation:
Polarity is a phenomenon that has to do with the positive and negative electric (ionic) charges of a molecule. A molecule with distinct positive and electric charge is said to be POLAR. However, water is said to be a universal solvent because it dissolves more substances than any other solvent can.
This solvent property of water is a function of its POLARITY. Polar solutes dissolve in polar solvents. Hence, only polar solutes can dissolve in water (a polar solvent). Hence, in this case, CH3OCH3 (ether) will dissolve in water because it is a POLAR molecule/solute.
Which of the changes are chemical changes?
sugar is dissolved in soda
Answers
Soda is carbonated water - it has carbon dioxide dissolved under high pressure. Carbon dioxide is a gas that would like to escape. Shaking the bottle of soda, for example, provides a suitable mechanism to allow release of the gas.
Adding sugar also provides a mechanism for this to occur through nucleation. The sugar crystals give the carbon dioxide a surface via which to escape the solution. This is not a chemical reaction per se, but a physical reaction. It is essentially the same process as the coke-mentos reaction. Sugar crystals are great for this, as they have a rough surface and therefor a very high surface area available.
NEED ANSWER NOW! 40 POINTS
Read the chemical equation.
Fe2O3 + CO → Fe + CO2
if 1.8 moles of Fe2O3 react with 2.7 moles of CO, how many moles of each product are formed?
5.4 moles Fe and 1.8 moles CO2
2.7 moles Fe and 0.9 moles CO2
3.6 moles Fe and 5.4 moles CO2
1.8 moles Fe and 2.7 moles CO2
Answers
Answer:1.8 moles Fe and 2.7 moles CO2
Explanation:
Answer:
1.8 moles Fe and 2.7 moles CO2
I NEED HELP. This is about science
Answers
Answer:
Independent variable
Explanation:
Which statement describes the Arrhenius interpretation of acids and bases?
It has a wider range of applications than the Bronsted-Lowry interpretation.
It has a wider range of applications than the Lewis and Bronsted-Lowry interpretatio
It is used in situations that involve bases that do not produce hydroxide ions.
It is limited to situations that involve aqueous solutions or specific compounds.
Answers
Answer:
D. It is limited to situations that involve aqueous solutions or specific compounds.
Explanation:
An Arrhenius acid is a substance that increases the concentration of H3O or H+ when dissolved in water. An Arrhenius base is a substance that increases the concentration of OH- when dissolved in water. These definitions tell us that D is indeed limited to situations that involve aqueous solutions or specific compounds, as aqueous means something that's dissolved in water.
A is wrong because the Bronsted-Lowry interpretation has a wider range of applications. Bronsted-Lowry acids and bases don't even need to be aqueous, so it is not limited to just aqueous solutions. They include any substance that can donate or accept a H+.
B is wrong because A is wrong. A and B basically say the same thing, that the Arrhenius interpretation has a wider range of applications than the Bronsted-Lowry interpretation.
C is wrong because the definition of an Arrhenius base is any substance that increases the concentration of OH-, or hydroxide ions. C completely counters this statement.
Here's photo for proof incase you're doubtful of my answer & explanation. Please click the heart if it helped.
Answer:
Which statement describes the Arrhenius interpretation of acids and bases?
❌ A) It has a wider range of applications than the Bronsted-Lowry interpretation.
❌ B) It has a wider range of applications than the Lewis and Bronsted-Lowry interpretations.
❌ C) It is used in situations that involve bases that do not produce hydroxide ions.
✔️ D) It is limited to situations that involve aqueous solutions or specific compounds.I Took Question Test And Have Nice Day.
C(s)+H2(g)-> C2H6(g)
Answers
Explanation:
2 C(s) + 3 H2(g) = C2H6(g)
What is the wavelength in meters of a wave with a frequency of 3000Hz?
a. 100000m
b. 9x1011m
c. 2.21x10-37m
d. 1000m
Answers
Answer:
yes thats right
Explanation:
What is exfoliation?
Answers
Answer:
Exfoliation involves the removal of the oldest dead skin cells on the skin's outermost surface. Exfoliation is involved in all facials, during microdermabrasion or chemical peels. Exfoliation can be achieved by mechanical or chemical means.
Explanation:
I did copy off internet!
:P
what's the valency of lead in pbO2
Answers
The valence of lead is 4.
Hence the name of the compound is called Lead (IV) oxide.
Further explanationGiven
PbO₂ compound
Required
The valence of Pb
Solution
The oxidation number of element O in the compound = -2, except for OF₂ the oxidation state = + 2 and the peroxides (Na₂O₂, BaO₂) the oxidation state = -1 and superoxide, for example KO₂ = -1/2.
The oxidation state in the uncharged compound = 0,
So The oxidation state of Pb :
Pb + 2.(-2) = 0
Pb - 4 = 0
Pb = +4
True or False: The climate in landlocked areas is usually more moderate than in coastal areas.
Answers
Answer:
False
Explanation:
Water is said to have a higher heat capacity than soil and stones, so the ocean takes much longer to heat and to cool than the land. 2. Coastal areas have more moderate temperatures than landlocked areas because of the heat capacity of the ocean and hence the answer is false.
Answer:
False.
Explanation: